Windows 2000 "Screen of death"

I'm wondering if someone could help me out in fixing my computer. I received the blue screen about a week ago. The computer (BIOS) starts up but windows fails to load. Here is the error it gives me at startup:

STOP: 0x0000007B (Cx85E3EB30, 0xC0000032, 0x00000000, 0x00000000) Inaccessible_boot_device

I went into the BIOS and changed my primary boot device to the floopy drive and disconnected the cd rom drive power and pin cable but had no such luck, same error. I then disconnected the cd burner and restarted the computer but the error remained the same. I would hate having to re-format the hard drive cause I would loose valuable data. I tried staring in Safe Mode and using a Previous Working File with no success. I get a message below the error saying to try running CHKDSK /F, how can I do this. Can anyone help with this error.

Thanks in advance,
-SomeUser